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Start by removing the fuel filter in the tank and replacing, remove the top cover and clean the air filter, if there is a spark arrestor in the muffler remove and clean the gauze. Now try again.
Basics to check:
1) Spark plug - brown or dark brown - OK a) is it carbon or fuel fouled b) is there spark
2) Muffler remove for inspection a) exhaust screen clean or plugged b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression
Remove and clean the fuel tank with carburetor cleaner then blow out with compressed air. You can buy the fuel line at small engine dealer. Replace fuel lines. Remove and clean the muffler. Remove and disassemble the carb. (making sure how it goes together). clean the carb. with carb. cleaner. If the diaphragm and gaskets look bad, replace. You can find all the carb. parts on the internet if you can not find locally. Remove and clean sparkplug. Check the blower impeller for dirt dobber nest etc. Install proper mix fuel and go to it. You will have much difficulty finding McCulloch parts list as the company went bankrupt a few years ago and the companies that have bought the name have not kept up the parts.
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